Tack-driving machine.



F. L. MAOKENZIE.

TACK DRIVING MACHINE.

APPLICATION FILED 11111.11, 1911.

l ,081 ,456. Patented Dec. 16, 1913.

2 SHEETS-SHEET 1.

F. L. MAOKENZIE.

TACK DRIVING MACHINE.

APPLICATION FILED 11111.11, 1911.

L8l945@ Patented Dec. 16, 1913.

2 SHEETS-SHEET 2.

l?? We @@21- COLUMBIA P'LANoaRAFH co., WASHINuToN. D. d.

UNITE@ STATES sirena oriana.

FRED L. MACKENZIE,

OF BEVERLY, MASSACHUSETTS, ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY, OEPATERSGN, NEW JERSEY, A CORPORATION OE NEW JERSEY.

TACK-DRIVING MACHINE.

insiase'.

Specification of Letters Patent.

Patented Dec. 16,1913.

To alt whom t may Concern Be it known that I, FRED L. MACKENZIE, acitizen of the United States, residing at Beverly, in the county ofEssex andState of Massachusetts, have invented certain new and usefulImprovements in Tack-Driving Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

rIhe present invention relates to tack driving machines and moreparticularly to machines which are employed for driving holding tacksinto a lasted shoe to hold the upper in place after the lasting tackshave been removed, although the invention is capable of use in tack ornail driving machines which are used for other purposes.

In the manufacture of a welted shoe, it is customary to withdraw all ofthe lasting tacks, except those which hold the toe wire in place, beforethe welt is sewed upon the shoe and insert in place of the lasting tacksa sufficient number of holding tacks to retain the upper in positionupon the last during the sewing operation. In order that the operatormay pull the lasting tacks and insert the requisite number of holdingtacks during a single manipulation of the shoe, combined tack pullingand driving machines have been devised. In these machines, the mechanismfor driving the holding tacks is under the control of the operatorwhereby, upon the depression of a suitable treadle, a l'iolding tack maybe driven at any point desired. As it is only desired to drive a singleholding tack at any one point, it is essential that the tack drivingmechanism shall be arranged to drive only a single tack upon adepressing of the treadle irrespective of the length of time which thetreadle is held down, and it is furthermore desirable that after onetack has been driven the tack driving plunger shall be automaticallyreturned to its initial position and held in this position independentlyof the treadle, in order that another tack may be instantly driven whenthe treadle is again depressed.

The object of the present invention is to provide a machine of thecharacter described which drives the tacks with precision and certainty,and-in which the operator is prevented from driving more than a singletack jupon each separate actuation of the control ,mechanism.

i TWith this object in view, one feature of Iithe invention contemplatesthe provision of a spring actuated tack driving plunger, means fornormally holding the plunger in a raised position, power actuatedmechanism for releasing the holding means, control mechanism adapted toset the power actuated mechanism into operation at the will of theoperator, and independent means for rendering the power actuatedmechanism inoperative after the holding means have been released.

In addition, another feature of the invention consists in thecombination of a spring actuated plunger, continuously operated meansfor elevating the plunger, means for holding the plunger in an elevatedposition, and mechanism actuated in timed relation with the elevatingmeans to release the holding means and allow the plunger to bedepressed, the said mechanism being under the control of the operator.

A further feature of the invention consists in the provision in amachine of the character described comprising a spring actuated tackdriving plunger and means for holding the plunger' in a raised position,of mechanism under the control of the operator to release the holdingmeans and means to render the mechanism inoperative after a singleworking stroke of the tack driving plunger.

Gther features of the invention consist in certain improvedconstructions, combinations and arrangements of parts hereinafterdescribed and claimed, the advantages of which will be obvious to thoseskilled in the art from the following description.

In the accompanying drawings, illustrating the preferred form of theinvention, Figure l represents a front elevation of a tack drivingmechanism of a well known type, with the preferred form of the presentinvention applied thereto, said tack driving mechanism forming part of acombined tack pulling and driving machine; Fig. 2 is a side elevation ofthe mechanism illustrated in Fig. l; Fig. 8 is a detail sectional planview on the line 8 3 of Fig. 2; Fig. el is a detail sectional view onthe line fst- 4 of Fig. 2.

rIhe tack driver shown in the drawings is of well known construction andfor this reason has not been shown in detail. It comprises a tackdriving plunger 1 which is actuated upon its downward or working strokeby a spring 3. The lower end of the plunger passes through a tack block5 against the bottom of which the work is held. The supply of tacks iscontained in a tack pot 7 from which the tacks are fed to the tackdriving plunger by means of a chute 8. A mechanically operated finger 9projects into the chute at its lower end and engages the tacks tosuccessively move them into position beneath the plunger 1 at the propertime. To automatically raise the plunger to its initial position' aftereach tack has been driven, a continuously rotating cam 10 is employedwhich is provided with a laterally projecting cam rib 11 upon one facethereof. The cam rib 11 engages with a projecting shoulder 12 formedupon the connecting rod or plunger 13 and operates to raise the rod andplunger 1 when the plungerl has reached the limit of its downwardmovement. The plunger is retained in its raised position by a springpressed latch dog 14 which engages at one end with a notch 15 formed inone face of the shoulder 12. The cam 10 is mounted upon a shaft 16 andis continuously operated from the main drive shaft 17 through the gears18 and 19.

In order to properly actuate the tack driver, it is essential that meansbe provided, under the control of the operator, for disengaging thelatch dog 14 to allow the plunger to descend and drive a tack and toimmediately render this means inoperative in order that the latch shalllock the plunger in its raised position when it is returned by thecontinuously rotating cam 10. lVth this end in view, the latch dog 14 ispivoted at 20 upon the side of the casing 21 and is connected at itslower end to the outer end of a link 22. rThe link 22 is slidinglymounted in the casing 21 and is provided at its inner end with adownwardly projecting portion 23, which engages with one arm 24 of abell-crank lever 25. The opposite arm 26 of the bell-crank lever ispivotally connected to a rod 27 so that upon a longitudinal movement ofthe rod the bell-crank will be oscillated to disengage the latch 14through the link 22. This longitudinal movement is imparted to the rod27, when desired, by an oscillating forked arm 23 which is provided witha spring pressed dog 29 adapted to engage with a shoulder 30 formed uponthe outer face of the rod 27. The arm 23 is continuously oscillated in asubstantially horizontal plane during the operation of the machine, by acam 31 mounted upon the shaft 16 and provided with a cam groove 32. Acam roll 33, which is journaled upon the outer end of an arm 33, engageswith the cam groove 32. The

two arms 23 and 33L are both fixed to a sleeve 34 which is journaled ina supporting bracket 35 fastened to the frame of the machine. The abovedescribed mechanism forms what may aptly be termed a power actuatedmechanism for releasingthe holding means o-r spring pressed latch dog.The rod 27 is normally held out of engagement with the dog 29 by ayoke-shaped member 36. The member 36 is supported at one end of alongitudinally projecting stub shaft 37 Ywhich is slidingly journaled ina fixed bearing 33, and a stud 39 is threadedly mounted in an offsetportion 40 of the member 36. The member 36 is operatively connected witha control mechanism comprising a lateral projection 41 formed upon theupper end of a rod 42 and engaging with the stud 39. The rod 42 issuitably connected to the operating treadle, not shown. Vhen theprojection 41 is moved downwardly by the treadle the member 36 ispartially rotated to render the power actuated mechanismr operative,that is, to move the rod 27 into engagement with the dog 29 so that therod is moved longitudinally to disengage the latch 14. The movement ofthe arm 2S is so timed that the plunger will be released when theprojection 11 on the cam 10 is at one side of the projection 12 or insubstantially the position shown in Fig. 1.

- If the rod 27 were held in engagement with the dog 29 as long as thetreadle was depressed, the machine would continue to drive tacks and asthis is not desired, independent means are provided to return the rod 27to its normally inoperative position after a single longitudinalmovement of the rod to disengage the latch dog` 14. To this end ashoulder 43 is provided upon the inner face of the rod 27 which isnormally located in the position shown in Fig. 3. Upon a longitudinalmovement of the rod to disengage the latch dog, however, the shoulderedportion 43 will slide through the member 36, and when the arm 23commences to move in the opposite direction, the spring pressed dog 29bearing against the outer side of the rod 27 will retain the shoulder 43in engagement with the face of the member 36. rl`he rod 27 is returnedto its initial position by a spring 44 carrying the member 36 with itand as soon as the head of the stud 39 passes from under the projection41' the member 36 is moved back to its normal position carrying the rod27 out of engagement with the dog 29. The finger 9 is con venientlyconnected to the rod 27 so that the finger is operated to feed a tacksimultaneously with the movement of the latch dog to release the tackdriving plunger. he rotation of the member 36 is imparted by a coiledspring 45 which is fastened at one end to a head 46 mounted upon the endof the rod 37 and at its opposite end to a head 47 formed upon thebearing 38. 1mmediately upon releasing the treadle, the projection il israised clear of the stud 89, which is then moved back to its initialposition by the spring 45. rl`hus it will be seen that the poweractuated mechanism is automatically rendered inoperative after onestroke of the plunger irrespective of the position of the treadle, andthat immediately upon releasing the treadle, the various parts of themechanism will instantly assume their initial positions in order thatanother tack may be driven when desired. To permit the latch dog la tomove freely while the plunger is being raised, the connection betweenthe dog and the slide 22 is arranged to allow the dog to moveindependently of the slide, the lower end of the dog being slotted toreceive the slide, and the slide being provided at its outer end with across pin to engage the dog when the slide is actuated by a depressionof the controlling trcadle.

lWhile it is preferred to employ the specic construction and arrangementof parts shown and described, it will be understood thatI thisconstruction and arrangement is not essential except so far as specifiedin the claims and may be changed and modified without departingfrom thebroader features of the invention.

Vilhat is claimed, is zl. A tack driving machine having, in combination,a spring actuated tack driving plunger, continuously operated means forraising the plunger, means normally tending to hold the plunger inraised position, mechanism under the control of the operator to releasethe holding means, and means to render the mechanism inoperative after asingle working stroke of the tack driving plunger, substantially asdescribed.

2. A tack driving machine having, in combination, a spring actuated tackdriving plunger, continuously operated means for raising the plunger,means normally tending to hold the plunger in raised position, poweractuated mechanism for releasing the holding means, and mechanism tocontrol the operation of the power actuated mechanism to allow a singleworking stroke of the tack driving plunger, substantially as described.

3. A tack driving machine having, in combination, a spring actuated tackdriving plunger, continuously operated means for raising the plunger,means for holding t-he plunger in raised position, a continuouslyoscillated arm, a spring pressed dog mounted upon the arm, avrodnormally held out of engagement with the dog, operative connectionsbetween the rod and holding means, and means under the control of theoperator to move the rod into the path of the dog in order to move therod and release the holding means, substantially as described.

t. A tack driving machine having, in combination, a spring actuated tackdriving plunger, continuously operated means for raising the plunger,means for holding the plunger in raised position, a continuouslyoscillated arm, a spring pressed dog mounted upon the arm, a trodnormally held out of engagement with the dog, operative connectionsbetween the rod and holding means, means under the control of theoperator adapted to move the rod into the path of the dog in order tomove the rod and release the holding means, and means for returning therod to its normal inoperative position out of engagement with the dogafter the holding means has been released, substantially as described.

5. A tack driving machine having, in combination, a spring actuated tackdriving plunger, continuously operated means for raising the plunger,means for holding the plunger in raised position, a continuouslyoscillated arm, a spring pressed dog mounted upon the arm, a rod,operative connections between the rod and holding means, a yoke-shapedmember embracing the rod and adapted to normally hold the rod out ofengagement with the dog, and

`means under the control of the operator adapted to actuate the yoke andmove the rod into the path of the spring pressed dog, substantially asdescribed.

(5. A tack driving machine having, in combination, a spring actuatedtack driving plunger, continuously operated means for raising theplunger, means for holding th-e plunger in raised position, acontinuously oscillated arm, a spring pressed dog mounted upon the arm,a rod, operative connections between the rod and holding means, ayoke-shaped member embracing the rod, a shoulder formed upon one face ofthe rod, control mechanism operatively connected to the yoke-shapedmember and adapted to move the rod into a position in which the shoulderis engaged by the spring pressed dog in order to slide the rodlongitudinally, and means for returning the rod to its normalinoperative position independently of the control mechanism,substantially as described.

7. A tack driving machine having, in combination, a spring actuated tackdriving plunger, a continuously rotated cam having a cam rib formed uponone face thereof, a shoulder projecting laterally from the plunger andhaving a recess formed in one face thereof, the shoulder being adaptedto engage with the cam rib to raise the plunger, means for holding theplunger in raised position comprising a spring pressed dog arranged toengage with the recess in the shoulder, and means under the coiitrol ofthe operator for moving the dog out of engagement with the recess inorder to release the plunger, substantially as described.

S. A tack driving machine comprising a spring actuated tack drivingplunger, a continuouslyl oscillated arm, a spring pressed dog mountedupon the arm, a rod, a yoke-shaped member embracing the rod, a studprojecting from the yoke-shaped member, a laterally projecting memberhaving its under face engaging with the stud, the rod being providedwith shoulders upon its opposite faces, a spring operatively connectedto the yoke-shaped member and adapted to normally retain the stud inengagement with the laterally projecting member, and means under thecontrol of the operator for actuating the laterally projecting member inorder to move the rod into a position where one shoulder is engaged bythe spring pressed dog and moved longitudinally thereby, the oppositeshoulder upon the rod adapted to engage with the yoke-shaped member uponmovement of the rod, and means for sliding the rod back to its initialposition, the yoke adapted to move the rod out of engagement with thedog upon the backward movement, substantially as described.

9. A tack driving machine comprising a rod mounted to slidelongitudinally and provided with shoulders upon its opposite faces, ayoke-shaped member embracing the rod, a continuously oscillated arm, aspring pressed dog mounted thereon, control mechanism operativelyengaging the member and adapted to rotate the yoke-shaped member andmove the rod into a position where the spring pressed dog will engagewith one shoulder and slide the rod longitudinally, the yoke-shapedmember acting to retain the rod in engagement with the dog durino thelongitudinal movement, the opposite shoulder upon the rod adapted toengage with the yoke-shaped member at the end of the longitudinalmovement of the rod, means ior sliding the rod back to its originalposition, the yoke-shaped member being carried with it out of operativeengagement with the control mechanism and means for partially rotatingthe yoke-shaped member to move the rod out of the path of the springpressed dog, substantially as described.

l0. A tack driving machine having, in combination, a spring-actuatedtack driving plunger, continuously operated means for raising theplunger, means for holding the plunger in a raised position,power-actuated mechanism for releasing the holding means, controlmechanism adapted to set the poweractuated mechanism into operation atthe will of the operator, and independent means for rendering thepower-actuated mechanism inoperative after the holding means has beenreleased, substantially as described.

ll. A tack driving machine having, in combination, a spring-actuatedtack driving plunger, continuously operated means for raising theplunger, means for holding the plunger in raised position, trippingmechanism for releasing the holding means, power-actuated mechanismnormally disconnected from the tripping mechanism, means under thecontrol of the operator for connecting the power-actuated mechanism tothe tripping mechanism, and independent means for disconnecting the twomechanisms after the holding means has been released, substantially asdescribed.

l2. A tack driving machine having, in combination, a spring-actuatedtack driving plunger, continuously operated means for raising theplunger, means for holding the plunger in a raised position, apower-actuated arm, a rod normally disconnected from the arm andoperatively connected with the holding means, and means under thecontrol of the operator to connect the arm and rod whereby the rod isactuated to release the holding means, substantially as described.

13. A tack driving machine having, in combination, a spring-actuatedtack driving plunger, continuously operated means for elevating theplunger, means for holding the plunger in an elevated position, andmechanism actuated 4in timed relation with the elevating means torelease the holding means and allow the plunger to be depressed, thesaid mechanism being under the control ot' the operator, substantiallyas described.

14. A tack driving machine having, in combination, a spring-actuatedtack driving plunger, continuously operated means for raising theplunger, means for holding the plunger in a raised position,power-actuated mechanism for releasing the holding means, and means forrendering t-he power-actuating mechanism inoperative after the holdingmeans has been released, substantially as described.

FRED L. MACKENZM.

Nitnessesz CHESTER E. ROGERS, LAURA M. GooDRIDGE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

